[Nottingham] Time

[Peter Chang]

Josh,

In time(1), user and system times are the times spent by the process in 
user mode and kernel mode respectively. I/O will usually be counted as 
system time.

> An initial guess is that system measures things like disk i/o. Which 
> would explain why after the first of 5 consecutive runs it's consistent.

This is caused by caching from disk into memory and flushing dirty pages 
of other (sleeping) processes if there is any memory pressure.

Peter


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